Engineered interfaces improve electrical friction in the oxide material

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Multilayer Structure And Electrostatic Tightening Characteristic Of NGO/CGO/[ESB/CGO]n. attributed to him: temper nature (2022). DOI: 10.1038 / s41586-022-05073-6

An international team of researchers has found a way to improve electrical friction in an oxide material by atomic engineering of the interfaces of the layers from which it is made. In their paper published in the magazine temper nature, the group showed that electrical contraction in oxides can be enhanced through the use of synthetic interfaces. David Egger of the Technical University of Munich published an article in News & Views in the same issue of the magazine outlining the work the group has done in this new effort.

Previous research showed that the application of electric field It can sometimes make desirable modifications to the shape of the material – a phenomenon known as electrical compressibility. It has been used extensively in the creation of actuators and actuators. Formally, it is described as the process of generating stress in a material by applying an electric field. Unfortunately, most of these applications involve the use of lead, which is a toxic substance, so researchers have been looking for other materials.

One such promising possibility involves the use of specially designed oxides, although the stitching has yet to be done. In this new effort, the researchers report a major step toward that goal. They found that a material made of layers of different oxides in certain ways could improve the degree of electrical contraction produced.

The work involved the application of very thin (nanometer scale) layers of different types oxide Films, one on top of the other, to create an article. They repeated the process, changing the thickness and number of layers, and each time measuring the coefficient of electrical friction, and were able to make incremental improvements. They were able to create a material with an electrical narrowing modulus 1500 times that of other oxides.

They reported that the thickness of the layers was the most important factor. They found that making it thinner led to atomic processes between two layers that combine electrical and mechanical effects. The researchers also found that adding stress to the materials had a pronounced effect on the dipoles within them, making them stronger and easier to orientate.

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more information:
Haiwu Zhang et al, engineered facades lead to unusual electrical narrowing, temper nature (2022). DOI: 10.1038 / s41586-022-05073-6

David A. Egger, Interfaces enhance the response to electric fields in layered oxides, temper nature (2022). DOI: 10.1038 / d41586-022-02948-6

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